入口点未发现异常 [英] Entry Point Not Found Exception

问题描述

我想在C＃项目中使用C ++非托管的DLL和我越来越想打电话，说该入口点无法找到函数时出错。

I'm trying to use a C++ unmanaged dll in a C# project and I'm getting an error when trying to call a function that says that entry point cannot be found.

public class Program
{

    static void Main(string[] args)
    {
        IntPtr testIntPtr = aaeonAPIOpen(0);            
        Console.WriteLine(testIntPtr.ToString());
    }

    [DllImport("aonAPI.dll")]
    public static extern unsafe IntPtr aaeonAPIOpen(uint reserved);
}

下面是该函数的DUMPBIN：

Here is the dumpbin for the function:

5    4 00001020 ?aaeonAPIOpen@@YAPAXK@Z

我改变了DLL进口函数[DllImport（aonAPI.dll，入口点=？aaeonAPIOpen）] 和函数[DllImport （aonAPI.dll，入口点=_ aaeonAPIOpen）] 和没有运气。

I changed the dll import to [DllImport("aonAPI.dll", EntryPoint="?aaeonAPIOpen")] and [DllImport("aonAPI.dll", EntryPoint="_aaeonAPIOpen")] and no luck.

推荐答案

使用undname.exe工具，该符号地还原到

Using the undname.exe utility, that symbol demangles to

 void * __cdecl aaeonAPIOpen(unsigned long)

这使得适当的声明：

    [DllImport("aonAPI.dll", EntryPoint="?aaeonAPIOpen@@YAPAXK@Z", 
        ExactSpelling = true, CallingConvention = CallingConvention.Cdecl)]
    public static extern IntPtr aaeonAPIOpen(uint reserved);

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